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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87beb4fc32ae4caa702f3b8e6413a1a53bae055d854172e789384d713e616fdb' 
  AND token = '8JtjT0hx267rOvqTNDxKaNR9I/XYQDvuysvjEET+MIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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