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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c66dc4b24aac70f5f18dc7881b0ff2426eecbb8ccd3dad4f46abbdcc44ea56b5' 
  AND token = 'ZVgOOP1YgMpepeMrXEzg99sNkE+U4pps/R9Gd6rUlfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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