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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4679bc43b67a3aab2e26d9ce40644eea7e99083a1030733a3d4d13b994d2c39f' 
  AND token = 'uLOJGfVNjce61Ar9/s8t2rPY9JbecnNtGFquRMMLo60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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