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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d7da9f35f4821577507285f93871ffcdfebc1491f5d28e549be3b0f4c31573a' 
  AND token = 'CDiscAUFXaPeLTXXXWKtrF78iLLMGNhkFo3Sc84+XjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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