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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f537cc2b4e5e77c3c1467da898588091a8889b217f9f63da9bc7da7950bb668e' 
  AND token = 'k7VCZehthixufdH4kbGRc+xCmpDaAAPChNoZwhmdJLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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