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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d97cc4636f71d64e6dcce74a56d04ca02c391e1598d028d33620d41615dc73' 
  AND token = 'vCumKUzDw+yZtxogCOz3ubttMe6OLsT2qAE2VSzsePI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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