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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebeeb14649c8adf3499d6f6876c9a7f2843ccd7c2f535c8bdec21afe245d385' 
  AND token = 'T73FNDoHX5cO7CmqjovmE3smAHFr0RHXWcs4fEqY1y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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