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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d7cf1d85ad698f9bf3f3354d5ca2a5fa73d2a02c48b89657e2055c97cf296d0' 
  AND token = 'FfMO5V6KjjIzUyJv3qZ5C7X48MjcACpHU3RdDjii3hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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