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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd581fcbc258394a30835cabaaaf2bf57462d673664884f40dc97f4b51e1cdb7f' 
  AND token = 'tnMEtJLbSzTOIacbsmTxFVeqLu10LDG0YNdN97ufa7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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