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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbab5ce15399136f675193ff0d90313b5f2199bb6984d53e3aa931c3b6dc0d5' 
  AND token = '/fTdefXQSKoqiWAm0xGw0Vnhhny5C1Xi+cpgEMmcDqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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