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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a1615d2a38b6c7c47134321e4c4b9eed1c238116d9467550660f4a3f48f4ed' 
  AND token = '48sCMKuV2cD8zNtI5+kmhV+DNifDZUi0soTbGH6bFOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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