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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58285607fafa3d759ae6d1e09867a4d082b6e522ce3f91c7dfa69e61a0e58830' 
  AND token = 'uv2tnofaS5fZYbuBvys3zaDrB3T8K4iKOtPPWzu0Y+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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