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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1256bcd64420c3f502f6c36d7c3399c50f7245c95673fe590cb75b2d4d295fe' 
  AND token = 'MbfeZE5szzuJWnH4TUnV+BAbuy0xrgjh3ldEqrxOtmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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