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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbad475d7bdb3d2ceaf6ff5b6af34b09a3b65059e4dadf9c123a0696936f2c7e' 
  AND token = 'G4sSycPFmrP9H3iTPGM3vunrAhIcWC91xZcB7jyiois=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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