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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '628108ad015ef789090a0344c8476d5b4be428d9470c9455c2f6209552fa078f' 
  AND token = 'Fi7Q81oytML0pNBxWJS9IeABd/13jvic7rs84Elhi/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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