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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01542bdbc705b6948b3e58f0fd2ec94fa97ae06057d36463562d14a0e9aef4f9' 
  AND token = 'xb+8OeFZHy8MBKeTIZCw+ja4fwU7l2SweP9mMkkne7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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