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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64bab3d04c9dc6cd4c3c69e7a3bfd0e3b84085a4bcbf8f6486b8c8c5cc5259f7' 
  AND token = '1GRCLyalvsJPKzVUfZI2V0cLXo4KY6HQu4CsdgBbOm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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