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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6fd71de2e0cee7f32bf00d1575279e09ea7a7e676c3f7bb21008e6c035d3b9' 
  AND token = '4mOm7v1zhEP8oK19eh4S4MO6xRhePTOROstLeKWqmTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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