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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76f32a9bb8c0c1f97240f3d55194f8de031d131c3d12b9000ea09365ed4ffed' 
  AND token = 'gllb3sOqAGoEXlOtNtjjIE3G4zFaTgQU1+bLIvVY1iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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