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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b5e7c8a79fbef885411265495b759b793cf9c2519a7f5ec0c0b27b6a967170' 
  AND token = 'NeRHUk8rEJ8tICpsEdIi59+zUPfdAppUXyjl7zy/7R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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