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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a4c56e0b942985b970923b810099b755646444e22aecb57b420a79f1fcb46c' 
  AND token = '3nXBeINIk0bLXa5Hj891MMpgzgcwE5OSLb/T1bB7zYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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