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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '625e7e7b9a8f6295da5051622d7606199fea8867392cb0de09202c569a20bfe7' 
  AND token = 'ijThSROfOuLsk02iIdqQDhlazR1TGsATPj2JeL1TPu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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