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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1854eb47f69c77c438dea0740720cbd87ceb7cca554d1939d35d754461fc3ca9' 
  AND token = 'eZI0etERUqVXXNDdUz32OTdG2sQmedggD+WNBm7Asb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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