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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fdf003675e89876abec2cb00aff96570a420b54cbd0ee98ceef3ad7c3722f97' 
  AND token = 'nkTYbBiJEYCaQgBzdZM6BxLjoTpeDzfdkcca5Ph1K5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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