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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f719a8baa2e6aca80fcfccac0084281d4a42d864b243f63935bc528c9788e934' 
  AND token = 'HYxaZeWNjat7kuvDScqMEvjbz/BMmycU/URu+d/HarI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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