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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb25dcca5009f4910fcedaa26ebb210cc2a7c8ed5a1f0497b6264667926c6cae' 
  AND token = 'e5oTeP6pDLqkrbnOfHI5WJlAk0J6plDzQf2ZBtW2wP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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