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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12bf301432c0087a34e4eb306efce8091f97830a227fe4f115794af5f867f28e' 
  AND token = '0upeT08642qk9PUgbnJJS9b6g6Hkkd1+hE1LeHWWYlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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