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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda1e1abe216d074b17f6ba92121aa3884b5abc19c57d2bb177a98bada91b834' 
  AND token = 'D9cwomCOCyRhFBADO3RGy6GkZ4kF9Oqwpg6oLZn89W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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