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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2ced6531e82a23e62b97c66886955bad206ecbdab4fc06d9867996902e0f28' 
  AND token = 'qNusjS2gqub/0eiN0j91tssBGCF8Lfs0s4tiCrQbuh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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