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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae022b2609fe304647a01cc8d193175585c980b4ddc979acd7d05ccdfae8107' 
  AND token = 'jLMwbAubYaAhQ/nExUJ6hGaTgu1x+D4SFDxfqYQAQBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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