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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55bd9084371fbf99c33efb10d196b06ac3746be77608603ad1a65db8a1d3eb5a' 
  AND token = 'skM0KLG4x9GIeqQoJKW3R9KditxESYIjy4MgoBDSVas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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