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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e209a29364a1f2d62fde027f58de3a49861f4a71507604dfcbb001470c3fff' 
  AND token = '4ar3n0E8bDEABN+ZdjGpEUc0c0yj0zm0M3SLzvIewlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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