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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c647e84e63d8f0dc76fae34ca48eae629a7766cd6aa4d01aa7ce1b9b29c8980' 
  AND token = 'faR29JEi0gnh2DVp47itrx0a3DqY+SGfxSMVJ8kQmr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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