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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea7bb14631f308196f08f61539d60f4fce46008223458c2aeb3499263baaad2' 
  AND token = 'c9eKrEQg5Mes4fRD7auoK2UA5DY5U7rRad0xdaD8I3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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