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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '164ea6e39d26cb55c96873a4f233f33b115adc3fc28ad3963f0fb3fbcdb02038' 
  AND token = '/t5FDpDF7w70+MYgCwWh1ItpkCUNQNClXXUYLeA/aKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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