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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61aa0d77faa8c24f2f8b545f72dc69ffa0741e3fb22939055801d6172a33adf' 
  AND token = 'ehr9hM1R1ir28UN7RjrG8O+rbibLU3AbXj3ruNUXk+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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