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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d05b5ce336ba04dca63978749ced6d107dcfd575c5040da9fdee15887a15317' 
  AND token = 'NFSUOpm5Y2qEL45ltkVBGK7L8VGtk103Po22zRZojc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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