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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb89a0c7573269b0af417786fb8f8e4ebd3ab16f3c82f4d271af814a6d7d249' 
  AND token = 'KKWA80waPZHpPSHpJh3tDid9qEORC3dZWb1n26GRov0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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