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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec31348a642671203e4de54cdd5c800c71ae73cfe224f91fe5b628a88f9b86b' 
  AND token = 'oC3aeVX5Rp6BT5iR/dsDBpqWftwkAsmOLarahWO4Lr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}