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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf51c3b645aa4efe94a90121ce7d53d87320dcfa1d6a5e186bd4f415870c02e' 
  AND token = 'SohrGtEkys9djHTKHtfF2WwLBGqwnqKU7d2GOogEk+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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