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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62c5a8bdeb77744ea993dfcba7e8c203f0b451f5fbd6aeb9bcba66c552fe893' 
  AND token = 'aRd44R1jUMZChyx0GP/B0k6rcEpipFZxyaMjZU3dIG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00163

JSON explain

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