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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4475e4057748a763841b2287d33ed6f98a529e0cf4abac907ef8269ee368e751' 
  AND token = '06yDkvUuzOSp5JJ03JkV4O1D7sFRXHypUn6wFAheOO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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