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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4710845adb4665830457c11e011b6d8fe1f2b3ee685c7f33b035356188db2167' 
  AND token = 'QTaHpvGXcHwU/JG9QgRQbLvAuzMnEd9zzEb7Xvv3Ar4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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