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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3304d217784287d4924ac8c80a090d099d53ea8fd2a574eaf215a8528dad8af' 
  AND token = 'X6s0VPoELzabZt7Vbxz56b6cJGlMSYdJEKlG/Np779E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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