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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3fd084a9c44fb16513c51bee1f99fef508954b97af8c0b9d6b1806fbae3d80' 
  AND token = 'WbjI1SpRySdNl/RZvAbgtQopHyU3J70fDKpN7ObgvdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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