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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecae02d49917a78ca69d00e809ff5d2a9df204a6cb875ca11369407f6fa83043' 
  AND token = 'gb2JyDLSWqnVBEALnF2Lr9XW7neB32BN3durKlExdlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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