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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ea8536bd2b1d1a496cc3c253fb8e92a1aac4cbfe0b99fc618939d28ed214bd' 
  AND token = '7ICKexmqXqe4FvOnpVL0lYcnsvWvzTUYlpntL192/kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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