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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b63c713ec2b2ab12ed971cf226bd196a7f3d5084d4800e0e9c4220b3111e2b' 
  AND token = 'EChDRgLlCHsO0zOT66G5OzjXHo1q+ocT5IyP4Yd+e7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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