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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb163ec9d3a9d9b3d13b5514b301713b4f75e7f0a4ab8ca3754a51b5596d023' 
  AND token = 'c+yaa1RnPiYbwPuTTo1BDmQCsMtgYb2hpb7T7Z1gKi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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