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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a22be777276a436eb78f225dc1957e11c797c16ccc4e943700e6d6f4457f1ee' 
  AND token = 'I4beEPgLlwm8DoIDTVNTJZCu+boi/2Ekyz/s+Ez63Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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