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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3053d23a1969ba97aba3aa38674ddb4ef426e899d77d5d33afe8e67f2766dd' 
  AND token = 'AHFKZMxWsk7F+/YPr+KYClPKWDowcHG9VEr0/LgrfSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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