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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e444f62323991fe83a6b93bb17de1ed2c744df852ade8a82d15829c9d4c9ccb4' 
  AND token = '9M27B6noLF3CxOvtS7B80bEX9KL/t3Mog1r6EcUrzT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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