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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d18681ca3b6aebb8da0ddd49e15ea558fb725c0796dfaa8a759eaec61f5432d' 
  AND token = 'JG7fEDn9RSA+gQqE/Oy2SlEji8W7+aYLbXcip3h96jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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