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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75084d2130a43ca54039ae5c828dfbe5f44e7f1460e2c292926af73926d2e45e' 
  AND token = 'iQBTNqqPBstaX006tIFD8gJFWgB2rjzFoJHhr9/K/3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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