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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7697d40dcc8685bf35b7d19738f2cedf5bcf84ae3284b26a66a651f5aa95f38' 
  AND token = 'c2Z5931x0ZL8Z77QNBCz0WzpaiOm//9yqFd6AgMtl6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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