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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cbb9c74a485d42d76e95e4f5f9976ddb2fb28c69a5835491855b55508eb16fd' 
  AND token = 'DkgonXJyBjJkoCp+2bpvneuVK5p90Ky1b/0PG4sSnxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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