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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98f32f91f35b2b69263530298fcad320e6bde4d3290ee27e0f059e26fe4b2a5' 
  AND token = 'aEGlvjEmEP3/oWY7uAaXA9Y0eg+I3yA4AXIjKWW3tQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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