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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe7aa4fcc6191aa4212a8c4ff7782dcfa173d9e61df2644f433ecdab9628d39' 
  AND token = '6sLRhKQdyQb+xh3xhQ0CTzpflViLp8/OS+nvEsEfYas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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