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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded9cc3c0ad8cfd393c7e677b65551a5c2bad5541e232e6cf307c88d6314a6eb' 
  AND token = 'heWYnXh9GkyVBXOr1UU+2iBshsFBqET7JGDtlnaVARA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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