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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31073a343a2b5d9b3330718e55acd0d2f7f295475bf33d1a205d3e27acfc6c53' 
  AND token = '3zsO8b32cAPsEnUyQXURknEJqiAdrqjO+JKYpU30w/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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